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Impedance Matching of Electrically Small Antenna with Ni-Zn Ferrite Film

Journal of Magnetics, Volume 18, Number 4, 31 Dec 2013, Pages 428-431

Jaejin Lee (The University of Alabama), Yang-Ki Hong *

(The University of Alabama), Woncheol Lee (The University of Alabama), Jihoon Park (The University of Alabama)

Abstract

We demonstrate that a partial loading of Ni_0.5Zn_0.5Fe₂O₄ (Ni-Zn ferrite) film remarkably improves impedance matching of electrically small Ba₃Co₂Fe₂₄O₄₁ (Co2Z) hexaferrite antenna. A 3 μm thick Ni-Zn ferrite film was deposited on a silicon wafer by the electrophoresis deposition process and post-annealed at 400 ^oC. The fabricated Ni-Zn ferrite film has saturation magnetization of 268 emu/cm³and coercivity of 89 Oe. A partial loading of the Ni-Zn ferrite film on the Co₂Z hexaferrite helical antenna increases antenna return loss to 24.7 dB from 9.0 dB of the Co₂Z antenna. Experimental results show that impedance matching and maximum input power transmission to the antenna without additional matching elements can be realized, while keeping almost the same size as the Co₂Z antenna size.

Keywords: electrophoresis deposition; Ni-Zn ferrite film; impedance matching; electrically small antenna; Co2Z hexaferrite

DOI: http://dx.doi.org/10.4283/JMAG.2013.18.4.428

Full Text: PDF

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